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Thread: CYA dropping

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    Join Date
    Apr 2016
    Location
    Hamilton, Ohio
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    CYA dropping

    Quote Originally Posted by pooldv View Post
    There are a few things that can/will reduce cya.

    You normally lose 2-3 ppm per month, up to 5 ppm in 90+ water
    High fc, such as SLAMing can lower CYA a bit faster
    Rain overflow
    Splash out
    Draining and refilling
    FC dropping below minimum can allow bacteria to grow and consume it and convert it to ammonia or nitrates
    The test is typically +/-10 ppm

    Thanks Pooldv,
    I also have noticed my CYA dropping. I did not know CYA can be lost with Slamming and 90 degree water. I do not feel crazy anymore!

    I thought I was at 35cya at the beginning of season because test last year stated that. Then i added 2 3" pucks on 7/12/16, 3 3" pucks on 07/19, 34 ounces stabilizer powder on 07/21/16 and 8 more 3" pucks by the date of 08/09/16. I have checked on and off cya level at home when I have the test and pool store otherwise. I had to order more cya tests and today the dot barely disappeared at 28?? I just added 3 more pucks today only because I have them for vacations and at this point they are free. My pool consumed 3 128 oz liquid shock today. I have been slamming all summer with a clear pool that will not hold overnight oclt and has 2 cc. I check about 3 to 4 times a day and use liquid shock and have been aiming between 16 - 18. I am averaging 2 128 oz 10% liquid shock a day and sometimes 3. On vacation I had someone stay here and run pump 24/7 like I have all summer. Dump in 64 oz in morning, 64 oz around 3 and 128 oz at dark just to keep it from turning green and to simplify. I just wanted to share that I also have had CYA disappearing. All summer I have spent $70 every two weeks on liquid shock and purchase large taylor regents of 0871, 0870 powder, stabilizer in granular form, ammonia test from fish store, Cya tests and not to mention my electric bill. And while on vacation we had like 4 inches of rain. My skimmer is now at the top with water. Good luck sky dude. I always thought splash out, ammonia, leaks and draining water were the only ways CYA left the pool. So, with me, my cya has been too low due to constant slamming, therefore the sun is consuming too much of my chlorine and causing my efforts to slam to fall short. In my case I guess using the automatic chlorine feeder during my slam process would of helped. I was counting, writing it down, ppm of CYA I added and trying to be careful to not add too much.
    13,500 AG 24 round, Hayward Xstream cartridge filter w Swimpro voyager filtration series,
    Hayward 1.5 hp pump, Install 2013, Taylor K-2006, auto trichlor feeder, Hayward Dave the Diver cleaner,
    City water, BBB

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    duraleigh's Avatar
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    Re: CYA drop

    Just a "few" tabs will have literally no affect on CYA, In that Phoenix Climate, I would manually dose it back to 60....test once more to be sure it's 40 before you do.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Aug 2014
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    Northern IL
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    Re: CYA drop

    R&S: maybe you could start your own thread?

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    Join Date
    Apr 2016
    Location
    Hamilton, Ohio
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    Re: CYA drop

    MarianParoo,
    I am new to forums and sometimes find it all confusing. Pooldv moved me to a new thread I believe.
    Thanks
    13,500 AG 24 round, Hayward Xstream cartridge filter w Swimpro voyager filtration series,
    Hayward 1.5 hp pump, Install 2013, Taylor K-2006, auto trichlor feeder, Hayward Dave the Diver cleaner,
    City water, BBB

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